Improvement in the manufacture of paper-pulp from wood



UNITED STATES PATENTOFEICE.

HARRISON B. MEEGH, OF FORT EDWARD, NEW` YORK.

IMPROVEMENT lN THE MANUFACT'URE 0F PAPER-PULP FROM WOOD.

Specification forming part of Letters Patent N0. 106,710, dated August23, 1870.

To all whom it may concern:

Be it known that I, HARRISON B. MEECH, of Fort Edward, in the county ofWashington and State of New York, have invented certain new and usefulImprovements in the Manufacture of NVood- Pulp for Paper; and do herebydeclare the following to be a full, clear, and exact descriptionthereof, reference being had to the accompanying drawing, and to theletters of reference marked thereon.

The nature of my invention consists ina new and improved process andapparatus for manufacturing woodpulp for paper, as will be hereinafterfully set forth.

In order to enable others skilled in the art to which my inventionappertains to make 'and use the same, l will now proceed to describe itsconstruction and operation, referring to the annexed drawing, whichforms a part of this specication, and in which- Figure l is a frontView, and Fig. 2 an end view, of my machine. Fig. 3 shows the machineinclosed in a steam tight vessel. Figs. 4 and 5 are detached views ofportions of the machine. Figs. 6 and 7 show a different construction ofthe machine, but involving the same principle.

The wood to be ground and bleached is first cut up into logs or blocksabout two feet long, to suit the machine, which is constructed asfollows:

A represents the frame of the machine, in

which are placed two iron rollers, B B, having their surfaces picked ormade rough like the surface of a file, so as to bruise the fiber oifinstead of cutting. These rollers are to be about one foot in length,placed side by side in the frame A, so as to nearly touch each other,and their journals a avare in suitable journal-boxes b b.

The rollers revolve toward each other at the rate of about two or threehundred revolutions per minute.

The log or block C of vwood to be ground has dogs d driven in each endand placed on the side of the rollers B B, where the log is made torevolve in either direction, and is held between the rollers with alight pressure until it is nearly ground up.

The machine thus constructed is placed in a steam-tight vessel, D, andsteam or chlorine gas is admitted into the same through the pipe e onthe ber while grinding, thus bleaching and grinding at the same time.

The steam or gas may be let on between the log and the grinding surfaceof the rollers when grinding. ln either case such steam or gas, at thesame time as it bleaches the ber, also softens it and facilitates 'thegrinding.

In Figs. 6 and 7 I have represented a conical cylinder, E, having thegrinding-surface on the inside and the steam or gas pipe e entering saidcone through the journal in the small end.

The log C of wood is held by a dog at one end andthe other end insertedin the cylinder. Here also the steam or gas is admitted to the fiberswhile grinding, so as to grind and bleach at the same time.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. The process herein described of separating the fibers from a log orblock of wood, the same consisting in rasping, grinding, or rubbing offthe fibers from the log or block while subjected to action of the steamin a closed vessel.

2. The jet of steam or gas applied between thewood and thegrinding-surface of the roller or rollers, as herein set forth.

8. Two revolving rollers having rasping or file-like surfaces soarranged as to act upon a log or other mass of wood, substantially asdescribed.

4. The grinding-rollers B B, so arranged as to act upon the log G withinthe vessel D, having steam or gas admitted into it, substantially as andfor the purposes herein set forth.

5. The combination of the conical cylinder E, log C, and steam or gaspipe e, as and for the purposes herein set forth.

6. The hereinfdescribed process of making pulp from Wood, the sameconsisting in separating the ber from the log or block and bleaching itby a continuous operation, as set forth.

HARRISON B. MEEOH.

Witnesses:

W. M. LANE, F. L. HODGMAN.

